package com.heima.kafka.sample;

import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * 消费者
 */
@Slf4j
public class ConsumerQuickStart {

    public static void main(String[] args) {
        //1.添加kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "47.97.69.121:9092");
        //消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group2");
        //消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");

        //取消自动提交偏移量 改为手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);


        //2.消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);

        //3.订阅主题
        consumer.subscribe(Collections.singletonList("itheima-topic"));

        //当前线程一直处于监听状态
        //同步 + 异步提交偏移量
        try {
            while (true) {
                //4.获取消息
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                }
                try {
                    //手动异步提交偏移量
                    consumer.commitAsync();
                } catch (Exception e) {
                    //手动异步提交偏移量异常,使用同步提交偏移量
                    log.info("手动异步提交偏移量异常:{}", e);
                    consumer.commitSync();
                } finally {
                    //释放资源
                    consumer.close();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("记录错误信息:" + e);
        } /*finally {
            try {
                //同步提交偏移量
                consumer.commitSync();
            } finally {
                consumer.close();
            }
        }*/


  /*      while (true) {
            //4.获取消息
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
*//*
                try {
                    //同步提交偏移量
                    consumer.commitSync();
                } catch (Exception e) {
                    System.out.println("记录同步提交偏移量异常:" + e);
                }*//*
            }

            //异步方式提交偏移量
            consumer.commitAsync(new OffsetCommitCallback() {
                @Override
                public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                    if (e != null) {
                        System.out.println("记录异步提交的偏移量:" + map + "异常信息为:" + e);
                    }
                }
            });

        }*/

    }

}